Governor for internal-combustion engines



Sept. 26, 1944. M. MALLORY GOVERNOR FOR INTERNAL-COMBUSTION ENGINES Filed July 9. 1942 INVENTOR, MARION MALLORY BY A the vacuum pump to control the governor.

Patented Sepia F269 im TENT OFFICE GOVERNOR FOR INTERNMCMBUSTION ENGINES y Marion Mallory, Detroit, Mich.

Application July 9, 1942, Serial No. 450,290

(Cl. 12S- 103) y5Claims.

This invention relates to a governor for an internal combustion engine and more particularly to a governor which controls the charge in the intake passageway of an internal combustion engine so as to govern the speed of the engine.

Engine speed governors at present in use are complicated in structure and not altogether dependable in operation. It is the object of the in'- vention to produce a governor for an internal combustion engine which is simple in structure and very dependable in operation.

The drawing shows a sectional view of a carburetor and engine intake manifold with a suction controlled governor valve.

The governor about to be described can be satisfactorily with any type of internal combustion engine regardless of how' the fuel and air are mixed preparatory to burning in the ee. For example, the governor can be used inst as wel! on an engine of the injection type wherein the raw fuel is injected into a cylinder ne Well as on an engine of the carburetted type where the fuel and air are passed through and are mixed in a carburetor. Therefore, by way of description rather than for purposesof limitation, the invention is exemplified by showing the same in combination with a carburetor I having a butterfly throttle valve 2 mounted on shaft l I is a throttle arm fixed on shaft 4 exteriorly of carburetor housing I. Il designates an auxiliary throttle housing located between the carburetor i and the engine (not shown). The engine intake manifold is designated I8. An auxiliary throttle valve B is mounted on shaft 1 journaled in housing 5. A crank arm l is fixed on shaft v'i exteriorly of housing l. 9 is a rod plvotally connected at one end with arm l. The other end of rod 9 is lixed to piston II which is reciprocably mounted in cylinder l0. A compression spring i2 tends to hold piston il toward the outer end of cylinder i0. Cylinder I0 is connested by conduit I4 with a vacuum pump I3. The vacuum pump I3 can be of any conventional type such as a rotary vane type vacuum pump, u centrifugal vacuum pump, or a rotary blade type pump. Pump I! is provided with a shaft ib which is driven by the internal combustion engine.

Cylinder il and piston II are merely exemplary oi a suction device which can be used with A exibie diaphragm type of suction device is just as suitable as the cylinder and piston type of suction device. The important thing is that the p I3 should be operated directly or indirectly that is, the area of that part of valve 6 above its axis of rotation is greater than the area of' that part of valve i below its axis of rotation, as shown in the drawing. Unbalancing of valve B makes possible the use of a smaller vacuum pump because the velocity of the charge flowing by the unbalanced valve 8 assists the vacuum. pump in closing the valve.

The line Il between the vacuum pump I3'and cylinder I0 is provided with an air bleed in the form of cylinderl I8 which communicates with conduit I4 through opening 2i. Cylinder Il is provided with air vents and 22 and houses a piston valve 23 which is normally held open by compression spring I9.

The operation of the device is as follows: As-

suming throttle valve 2 is held wide open. the

engine will receive a full charge. As the speed of the engine increases the speed of shaft 'Il will correspondingly increase. The pump Il will be air bled through orifices 22, 2l and line I4 but as the speed of shaft I5 increases the vacuum created by vacuum pump I3 will increase in proportion to the increase of engine speed and as the engine speed increases the vacuum will increase in cylinder I8 until the vacuum in cylindex' I8 reaches a point where the atmospheric pressure acting on piston 23 collapses spring I 9 and causes valve 23 to close orlce 2 I. Immediately upon the closing of orifice 2| the vacuum quickly increases in the cylinder IIJ thereby causing the atmospheric pressure to act on piston II, overcoming the spring I2 and thereby assisting the valve 6 to move towards closed position. As valve 6 moves toward closed position, the charge admitted to the engine is reduced and prevents the engine from overspeeding. Since valve 6 is unbalanced, the velocity of the charge flowing through the intake passageway by valve 6 assists the vacuum pump and suction device I0, II in closing the valve.

One of the disadvantages or weaknesses of the velocity governor, such as the unbalanced valve 8, is the so-called surging or hunting, that is, the unbalanced governor valve normally tends to vibrate thereby causing variations in the speed of the engine. My unbalanced governor valve C is stabilized by the vacuum pump Il and suction device I0, I I so that it will not surge or vibrate.

Whenever thespeedof the engine falls below a predetermined. speed the vacuum will fallin conduitv Il and cylinder i8y thereby permitting spring Il to withdraw valve 23 and open port 2| which causes a sudden falling of the vacuum in cylinder y Il which permits spring I2 to quickly open governor valve 6.

I claim:

1. A governor for an internal combustion engine having an intake passageway comprising an unbalanced throttle valve positioned in said intake passageway for. controlling the charge to said engine so that the charge' flowing by the unbalanced throttle valve urges the same towards closed position, and supplementary means controll'ed in accordance with the speed of the engine for assisting the unbalanced governor valve to close when the engine reaches a predetermined speed and for opening the unbalanced throttle valve when the engine falls below a predetermined speed, said supplementary means serving to stabilize the unbalanced valve and prevent vibrating ofthe same. l

2. A governor for an internal combustion engine having an intake passageway comprising an unbalanced throttle valve positioned in said in-r take passageway for controlling the charge to said engine so that the charge flowing by the unbalanced throttle valve urges the same towards closed position, a suction device connected to said unbalanced valve, said suction device serving to stabilize the unbalanced valve and prevent vibrating o! the same, and a vacuum pump independent l of said engine and operated in accordance with the speed of the engine, a conduit connecting said vacuum pump to said suction device whereby when the engine reaches a predetermined speed thevacuum produced by said pump acts through said suction device and moves the throttle valve towards closed position, and resilient means for moving the throttle valve towards open position when-the speed of the engine falls belowa predetermined speed and the vacuum drops in the said suction device.

3. Agovernor for an internal combustion engine comprising a throttle valve, a suction device, a connection between the suction device and the said throttle valve, a vacuum producing pump connected to said suction device and adapted to be driven so that as engine speed increases the vacuum createdby seid pumpv will increase, an air 'bleed to atmosphere for said pump, a valve controlling said air bleed and responsive to a predetermined vacuum created by said pump whereby said valve closes said air bleed at a predetermined desired speed and the full vacuum of the pump is impressed on the suction device which moves said throttle valve toward closed position to decrease the charge entering the engine.

4. A governor for an internal combustion engine comprising a throttle valve, a pressure responsive device, a connection between the pressure responsive device and the said throttle valve, fluid pressure producingmeans connected to said pressure responsive device and adapted to be actuated so that the eiiective pressure produced by said: means will vary in accordance with the speed of the engine, an air bleed to atmosphere for said means and a valve controlling said air bleed and responsive to a predetermined pressure created by said means whereby said valve closes saidair bleed at a predetermined engine speed and the full pressure created by said means is impressed on the pressure responsive device which moves said throttle toward closed position to decrease the charge` entering the engine.

5. Agovernor for controlling aninrnal combustion engine comprising in combination a rotary source of power, an engine controlling valve, a pressureV responsive device, a connection` between the pressure responsive device and the said control valve, a vacuum producing pump operated by'said .power and adapted to be driven so that asv the engine speed increases the vacuum created by said pump will cornespondinglyincrease, a conduit connecting said vacuum producing pump to said pressure responsive device, an air bleed to atmosphere for said pump, a valve controlling said air bleed and responsive to a predeterminedwacuum created by said pump wherebysaid.valve'closes said air bleed andA the full vacuuml produced bythe-pump isl impressed on the pressure responsive device which moves said control valve towardclosed position to control the speedV of the engine.l

y MARION MALLORY. 

